Review Request 29947: Fixed a race condition in hook tests for remove-executor hook.

[Kapil Arya]

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Review request for mesos and Niklas Nielsen.


Bugs: MESOS-2226
    https://issues.apache.org/jira/browse/MESOS-2226


Repository: mesos-git


Description
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The task must be killed properly before shutting down the driver. 


Diffs
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  src/tests/hook_tests.cpp PRE-CREATION 

Diff: https://reviews.apache.org/r/29947/diff/


Testing
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make check


Thanks,

Kapil Arya